Reduction plant for treatment of metallic sands or concentrates.



G.'F. RBNDALL, REDUCTION PLANT FOR TREATMENT METALLIC- SANDS OR UONCENTRATES. APPLICATION FILED JUNE 23,1908

986,086, Patented Mar. 7, 1911.

UNITED GEORGE FREDERICK RENDALL, OF NEW YORK, N. Y.

REDUCTION PLATVT FOR TREATMENT OF METALLIC SANDS 0R CONCENTRATES.

To all whom it may concern:

Be it' known that I, Gnonon' FREDERICK Its-sonar, a citizenof the United States, residing in the city and county of New York, State of New York, have invented a new and useful Reduction Plant forxfeatment of Metallic Sands 0r Concentrates, of which the following is a specification. V

This invention relates to an apparatus for the reduction of iron sands or Concentrated ore, which is received at the plant in a finely pulverized Condition.

The object of my inventionis to produce a furnace or reduction plant which can be operated with gas such as is generated from the distillation of wood, or in the manu facture of coal into coke or peat or kindred substances.

It further consists of other novel features. of construction, all as will be hereinafter fully set forth.

For'the purpose of illustrating my invention, I- have shown in the accompanying drawings one form thereof which is at present preferred by me, since the a has been found n practice to give satisr..;tory and reliable results, although it is to be understood that the. various instru-ment-alities of 1 designates which my invention consists can be variously arranged and organirled and that my invention is'not limited to the-precise arrangement and or anization of these instrumeno u a n talities as'herein shown; and described.

Figure 1 represents a side elevation of a;

1'6 into the chamber 8 and thus through the complete plant embodying my inventi Fig. 2 represents a section through thepbn veyer mechanism.

Referring to the drawings: a'bin of suitable size and constructionto receive ore as it 1s delivered from the mines and from which the chute 2 conveys the same positioned to discharge chamber by means of a valve 3 to a chamber t.

From this chamber 4 the ore isdelivered to v y the preferred form' as arotary furnace, operated in any suitablemanner, as by the gear 5. This is preferably composed of a steel shell provided with a suitable lining, as brick, and is into an air tight 6, from which theore is led to another rotating furnace 7 of similar construction to that before described, and operated in a like manner by gear 7'". The function a furnace 5 here shown in Specification of Letters Patent.

Application filed June 23,

Patented Mar. '7, 1911.

1908. Serial No. 440,048.

of the furnace 5 is to first heat the ore to a 'the furnace 7, the exit end of which is located adjacent a chamber 8 of air tight con struction and from which the discharge of ore is '*controlled by means of a valve 8. The opening of thisvalve 8 allows the ore within the chamber 8 to pass to a conveyer 9, preferably of spiral type, operated by a revolving shaft driven by a pulley 11. This spiral conveyer 9 operates through a water jacketed chamber 10 in order to-coo1 the ore as it passes through the conveyer.

12 designates crushing rollers suitably positioned adjacent the discharge end of the conveyer 9 and upon which the ore is de posited as it is delivered at regular intervals. These rollers crush the ore to a suitable ably takes place by passing the ore over magnetlc separators 13 from which it is de- These bins at the completion of the separation contain the two products produced, iron ore and dross. It will of course be understood that if the ore contains nonmagnetic particles of value, that other means of separation may be used, such taking the form of wet or dry concentration, as the case. may be.

The gaslused in preparing the ore is generated in a retort furnace 1 8 and is preferably made from the distillation of wood or coal. This gas is conducted at a high temperature under pressure through the conduit reduction furnaces to the furnace 5 in which itcombines with a suiiicient amount of air *to maintain combustion and preheat the ore. The air necessary to support combustion in this furnace 5 is furnished by means of a blower 19from which it.is delivered by a pipe 20 to the furnace 5 and after passing theret-hrough is exhausted through the pipes 21 and 22.1

In order furnaces 5 and 7 and permit the movement thereof, suitable roller bearings 23 are positioned at suitable intervals, as necessary.

"It will be apparent that I have provided an apparatus in which the volatile substances such l-as sulfur, arsenic and phos- ;phorus may be readily eliminated from the ore, after which the silicious gangue or dross may be mechanically separated from the mesuitable temperature ready for delivery to fineness ready for se )aration which arefer livered inthe respective bins 14c and 15.-

to properly support the rotating tallic contents, thereby preventing any danger of melting them into the molten n'letal in its finished state, which is oi. course a great saving in both fuel and fluxes. In such are as silicates, Where a chei'nical union exists between the silica and the metal, a separation cannot be eli'ectcd without a. di-

rect fusion, but by means of my novel apparatus a mechanical separation of the silica, can be effected, particularly in the case of an iron oxid if the ore is reduced fine enough.

A still further advantage of my apparatns resides in the fact that the character of the gases can be altered as desired, that is for one condition an oxidizing roast may he passed through the furnace, while in another a deoxidizing roast may be obtained.

It is further tobe noted that the discharge fromthe roast furnace does not take place in contact with the outside air Which is apt to produce rcoxidation. but it is discharged directly into a water jacketed. chamber out of contact with the air, which is a very important feature in the treatment of iron ores. This feature may be further extended if desired, by providing means to prevent exposure to the air While passing from the crushing rollers to the ore bin.

It will now be apparent that I have -devised a novel and useful construction which embodies the features of advantage enumerated as des rable in the statement of the 111-.

ven-tion and the above description and while I have in the present instance shown anddescribed the preferred embodiment thereof.which has been-found in practice to give satisfactory and reliable results, it late be understood that 'the same is susceptible of modification in various particulars Without departing from the spirit or scope of the i11- vention or sacrificing any of its advantages.

Having thus described my invention, What I claim as new and desire to ters Patent, .1s:-

1. In a device of the character stated, a

secure by Letpreheating furnace, a reducing furnace ad-- rotatable preheating furnace, a hopper suit ably mounted adjacent thereto and adapted to communicate therewith, an air chamber vertically disposed and positioned to re ceive the discharge from said preheating furnace, a reducing furnace communicating with said air chamber, means to supply a current of air to said air chamber, a gas generator having communication with said reducing furnace, and a cooling chamber into which the treated ore is discharged from said reducing furnace.

3. In a device of the character stated, a rotatable preheating furnace, a'hopper suitably mounted adjacent thereto and adapted to communicate therewith, an air chamber vertically disposed and positioned to receive the discharge from said preheating furnace,

a rotatably mounted reducing furnace com-.

municating With said air chamber, means to supply a current of air to said air, chamber, a gas generator having communication with said reducing furnace, and a cooling chamber into Which the treatedore is discharged from said reducing furnace,

GEORGE FREDERICK RENDALL. Witnesses E. HAYWARD FAIRBANKS,

C. D. MGVAY. 

